Rockbox General > Rockbox General Discussion

Sluggish when filling buffer

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PHK Brasil:

--- Quote from: Sentertainment on January 01, 2007, 07:38:18 PM ---I'm quite sure rockbox has a larger buffer too....it seems to be buffering 2-4 tracks ahead on my iPod.

--- End quote ---
Sentertainment, not in the case o iPod video 60gb. They have 64MB of total RAM, being 40MB for audio buffer.
Rockbox standard has only 30MB.


--- Quote from: soap on January 01, 2007, 06:09:10 PM ---But LLorean's basic question was "how often does Apple firmware rebuffer?"  I don't think he ever disputed that Apple FW appears to spend less time buffering.  
This can be tested quite simply by creating a playlist of high-bitrate music that is playable on both AppleFW and Rockbox, starting the playlist in one firmware, measuring how long the hard drive spins, then measuring how long until the drive spins again.
--- End quote ---
Yes, exactly what I did.


--- Quote from: Llorean on January 01, 2007, 07:11:44 PM ---As Soap said, I never denied that Rockbox likely buffers more slowly. What I'd like to establish is *how much* more slowly. :)
--- End quote ---
I showed that Apple's firmware spends less time buffering, filling more amount of buffer than Rockbox. Approximated 40MB against 30MB of Rockbox.

Sorry, if I'm doing a confusion here.

The complete results, tested with 320kbps CBR, iPod vídeo 5G 60gb

1)Apple's firmware fills 40MB buffer, and rebuffer after 17 minutes playing music

Time filling buffer:      -8s PLAYING


2)Rockbox’s firmware standard fills 30MB buffer, and rebuffer after 12:40 minutes

Time filling buffer:      -15s PAUSED
 Â                             -50s PLAYING
 Â                             -90s PLAYING / CROSSFEED ON


3)Rockbox’s firmware (64MB patch) fills 60MB buffer, and rebuffer after 25:20 minutes.

Time filling buffer:      -15sPAUSED
 Â                             -50s PLAYING
 Â                             -80s PLAYING / CROSSFEED ON

Basically, they are slowly when CPU is busy. PAUSED, they are much faster.

But, supposing iPods video 5G 30GB & 60gb have the same firmware... So, the iPod 30gb in Apple's OS has only about 10MB for audio buffer??

Maybe, anybody who has a 30gb one could test and tell us, please.

Bye, and sorry’bout my english.
♪

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